| // object.cc -- support for an object file for linking in gold |
| |
| #include "gold.h" |
| |
| #include <cerrno> |
| #include <cstring> |
| #include <cstdarg> |
| |
| #include "target-select.h" |
| #include "layout.h" |
| #include "output.h" |
| #include "symtab.h" |
| #include "object.h" |
| #include "dynobj.h" |
| |
| namespace gold |
| { |
| |
| // Class Object. |
| |
| // Set the target based on fields in the ELF file header. |
| |
| void |
| Object::set_target(int machine, int size, bool big_endian, int osabi, |
| int abiversion) |
| { |
| Target* target = select_target(machine, size, big_endian, osabi, abiversion); |
| if (target == NULL) |
| { |
| fprintf(stderr, _("%s: %s: unsupported ELF machine number %d\n"), |
| program_name, this->name().c_str(), machine); |
| gold_exit(false); |
| } |
| this->target_ = target; |
| } |
| |
| // Report an error for the elfcpp::Elf_file interface. |
| |
| void |
| Object::error(const char* format, ...) |
| { |
| va_list args; |
| |
| fprintf(stderr, "%s: %s: ", program_name, this->name().c_str()); |
| va_start(args, format); |
| vfprintf(stderr, format, args); |
| va_end(args); |
| putc('\n', stderr); |
| |
| gold_exit(false); |
| } |
| |
| // Return a view of the contents of a section. |
| |
| const unsigned char* |
| Object::section_contents(unsigned int shndx, off_t* plen) |
| { |
| Location loc(this->do_section_contents(shndx)); |
| *plen = loc.data_size; |
| return this->get_view(loc.file_offset, loc.data_size); |
| } |
| |
| // Read the section data into SD. This is code common to Sized_relobj |
| // and Sized_dynobj, so we put it into Object. |
| |
| template<int size, bool big_endian> |
| void |
| Object::read_section_data(elfcpp::Elf_file<size, big_endian, Object>* elf_file, |
| Read_symbols_data* sd) |
| { |
| const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| |
| // Read the section headers. |
| const off_t shoff = elf_file->shoff(); |
| const unsigned int shnum = this->shnum(); |
| sd->section_headers = this->get_lasting_view(shoff, shnum * shdr_size); |
| |
| // Read the section names. |
| const unsigned char* pshdrs = sd->section_headers->data(); |
| const unsigned char* pshdrnames = pshdrs + elf_file->shstrndx() * shdr_size; |
| typename elfcpp::Shdr<size, big_endian> shdrnames(pshdrnames); |
| |
| if (shdrnames.get_sh_type() != elfcpp::SHT_STRTAB) |
| { |
| fprintf(stderr, |
| _("%s: %s: section name section has wrong type: %u\n"), |
| program_name, this->name().c_str(), |
| static_cast<unsigned int>(shdrnames.get_sh_type())); |
| gold_exit(false); |
| } |
| |
| sd->section_names_size = shdrnames.get_sh_size(); |
| sd->section_names = this->get_lasting_view(shdrnames.get_sh_offset(), |
| sd->section_names_size); |
| } |
| |
| // If NAME is the name of a special .gnu.warning section, arrange for |
| // the warning to be issued. SHNDX is the section index. Return |
| // whether it is a warning section. |
| |
| bool |
| Object::handle_gnu_warning_section(const char* name, unsigned int shndx, |
| Symbol_table* symtab) |
| { |
| const char warn_prefix[] = ".gnu.warning."; |
| const int warn_prefix_len = sizeof warn_prefix - 1; |
| if (strncmp(name, warn_prefix, warn_prefix_len) == 0) |
| { |
| symtab->add_warning(name + warn_prefix_len, this, shndx); |
| return true; |
| } |
| return false; |
| } |
| |
| // Class Sized_relobj. |
| |
| template<int size, bool big_endian> |
| Sized_relobj<size, big_endian>::Sized_relobj( |
| const std::string& name, |
| Input_file* input_file, |
| off_t offset, |
| const elfcpp::Ehdr<size, big_endian>& ehdr) |
| : Relobj(name, input_file, offset), |
| elf_file_(this, ehdr), |
| symtab_shndx_(-1U), |
| local_symbol_count_(0), |
| output_local_symbol_count_(0), |
| symbols_(NULL), |
| local_symbol_offset_(0), |
| local_values_(), |
| local_indexes_() |
| { |
| } |
| |
| template<int size, bool big_endian> |
| Sized_relobj<size, big_endian>::~Sized_relobj() |
| { |
| } |
| |
| // Set up an object file based on the file header. This sets up the |
| // target and reads the section information. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::setup( |
| const elfcpp::Ehdr<size, big_endian>& ehdr) |
| { |
| this->set_target(ehdr.get_e_machine(), size, big_endian, |
| ehdr.get_e_ident()[elfcpp::EI_OSABI], |
| ehdr.get_e_ident()[elfcpp::EI_ABIVERSION]); |
| |
| const unsigned int shnum = this->elf_file_.shnum(); |
| this->set_shnum(shnum); |
| } |
| |
| // Find the SHT_SYMTAB section, given the section headers. The ELF |
| // standard says that maybe in the future there can be more than one |
| // SHT_SYMTAB section. Until somebody figures out how that could |
| // work, we assume there is only one. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::find_symtab(const unsigned char* pshdrs) |
| { |
| const unsigned int shnum = this->shnum(); |
| this->symtab_shndx_ = 0; |
| if (shnum > 0) |
| { |
| // Look through the sections in reverse order, since gas tends |
| // to put the symbol table at the end. |
| const unsigned char* p = pshdrs + shnum * This::shdr_size; |
| unsigned int i = shnum; |
| while (i > 0) |
| { |
| --i; |
| p -= This::shdr_size; |
| typename This::Shdr shdr(p); |
| if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB) |
| { |
| this->symtab_shndx_ = i; |
| break; |
| } |
| } |
| } |
| } |
| |
| // Read the sections and symbols from an object file. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::do_read_symbols(Read_symbols_data* sd) |
| { |
| this->read_section_data(&this->elf_file_, sd); |
| |
| const unsigned char* const pshdrs = sd->section_headers->data(); |
| |
| this->find_symtab(pshdrs); |
| |
| if (this->symtab_shndx_ == 0) |
| { |
| // No symbol table. Weird but legal. |
| sd->symbols = NULL; |
| sd->symbols_size = 0; |
| sd->symbol_names = NULL; |
| sd->symbol_names_size = 0; |
| return; |
| } |
| |
| // Get the symbol table section header. |
| typename This::Shdr symtabshdr(pshdrs |
| + this->symtab_shndx_ * This::shdr_size); |
| gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
| |
| // We only need the external symbols. |
| const int sym_size = This::sym_size; |
| const unsigned int loccount = symtabshdr.get_sh_info(); |
| this->local_symbol_count_ = loccount; |
| off_t locsize = loccount * sym_size; |
| off_t extoff = symtabshdr.get_sh_offset() + locsize; |
| off_t extsize = symtabshdr.get_sh_size() - locsize; |
| |
| // Read the symbol table. |
| File_view* fvsymtab = this->get_lasting_view(extoff, extsize); |
| |
| // Read the section header for the symbol names. |
| unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
| if (strtab_shndx >= this->shnum()) |
| { |
| fprintf(stderr, _("%s: %s: invalid symbol table name index: %u\n"), |
| program_name, this->name().c_str(), strtab_shndx); |
| gold_exit(false); |
| } |
| typename This::Shdr strtabshdr(pshdrs + strtab_shndx * This::shdr_size); |
| if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) |
| { |
| fprintf(stderr, |
| _("%s: %s: symbol table name section has wrong type: %u\n"), |
| program_name, this->name().c_str(), |
| static_cast<unsigned int>(strtabshdr.get_sh_type())); |
| gold_exit(false); |
| } |
| |
| // Read the symbol names. |
| File_view* fvstrtab = this->get_lasting_view(strtabshdr.get_sh_offset(), |
| strtabshdr.get_sh_size()); |
| |
| sd->symbols = fvsymtab; |
| sd->symbols_size = extsize; |
| sd->symbol_names = fvstrtab; |
| sd->symbol_names_size = strtabshdr.get_sh_size(); |
| } |
| |
| // Return whether to include a section group in the link. LAYOUT is |
| // used to keep track of which section groups we have already seen. |
| // INDEX is the index of the section group and SHDR is the section |
| // header. If we do not want to include this group, we set bits in |
| // OMIT for each section which should be discarded. |
| |
| template<int size, bool big_endian> |
| bool |
| Sized_relobj<size, big_endian>::include_section_group( |
| Layout* layout, |
| unsigned int index, |
| const elfcpp::Shdr<size, big_endian>& shdr, |
| std::vector<bool>* omit) |
| { |
| // Read the section contents. |
| const unsigned char* pcon = this->get_view(shdr.get_sh_offset(), |
| shdr.get_sh_size()); |
| const elfcpp::Elf_Word* pword = |
| reinterpret_cast<const elfcpp::Elf_Word*>(pcon); |
| |
| // The first word contains flags. We only care about COMDAT section |
| // groups. Other section groups are always included in the link |
| // just like ordinary sections. |
| elfcpp::Elf_Word flags = elfcpp::Swap<32, big_endian>::readval(pword); |
| if ((flags & elfcpp::GRP_COMDAT) == 0) |
| return true; |
| |
| // Look up the group signature, which is the name of a symbol. This |
| // is a lot of effort to go to to read a string. Why didn't they |
| // just use the name of the SHT_GROUP section as the group |
| // signature? |
| |
| // Get the appropriate symbol table header (this will normally be |
| // the single SHT_SYMTAB section, but in principle it need not be). |
| const unsigned int link = shdr.get_sh_link(); |
| typename This::Shdr symshdr(this, this->elf_file_.section_header(link)); |
| |
| // Read the symbol table entry. |
| if (shdr.get_sh_info() >= symshdr.get_sh_size() / This::sym_size) |
| { |
| fprintf(stderr, _("%s: %s: section group %u info %u out of range\n"), |
| program_name, this->name().c_str(), index, shdr.get_sh_info()); |
| gold_exit(false); |
| } |
| off_t symoff = symshdr.get_sh_offset() + shdr.get_sh_info() * This::sym_size; |
| const unsigned char* psym = this->get_view(symoff, This::sym_size); |
| elfcpp::Sym<size, big_endian> sym(psym); |
| |
| // Read the symbol table names. |
| off_t symnamelen; |
| const unsigned char* psymnamesu; |
| psymnamesu = this->section_contents(symshdr.get_sh_link(), &symnamelen); |
| const char* psymnames = reinterpret_cast<const char*>(psymnamesu); |
| |
| // Get the section group signature. |
| if (sym.get_st_name() >= symnamelen) |
| { |
| fprintf(stderr, _("%s: %s: symbol %u name offset %u out of range\n"), |
| program_name, this->name().c_str(), shdr.get_sh_info(), |
| sym.get_st_name()); |
| gold_exit(false); |
| } |
| |
| const char* signature = psymnames + sym.get_st_name(); |
| |
| // It seems that some versions of gas will create a section group |
| // associated with a section symbol, and then fail to give a name to |
| // the section symbol. In such a case, use the name of the section. |
| // FIXME. |
| std::string secname; |
| if (signature[0] == '\0' && sym.get_st_type() == elfcpp::STT_SECTION) |
| { |
| secname = this->section_name(sym.get_st_shndx()); |
| signature = secname.c_str(); |
| } |
| |
| // Record this section group, and see whether we've already seen one |
| // with the same signature. |
| if (layout->add_comdat(signature, true)) |
| return true; |
| |
| // This is a duplicate. We want to discard the sections in this |
| // group. |
| size_t count = shdr.get_sh_size() / sizeof(elfcpp::Elf_Word); |
| for (size_t i = 1; i < count; ++i) |
| { |
| elfcpp::Elf_Word secnum = |
| elfcpp::Swap<32, big_endian>::readval(pword + i); |
| if (secnum >= this->shnum()) |
| { |
| fprintf(stderr, |
| _("%s: %s: section %u in section group %u out of range"), |
| program_name, this->name().c_str(), secnum, |
| index); |
| gold_exit(false); |
| } |
| (*omit)[secnum] = true; |
| } |
| |
| return false; |
| } |
| |
| // Whether to include a linkonce section in the link. NAME is the |
| // name of the section and SHDR is the section header. |
| |
| // Linkonce sections are a GNU extension implemented in the original |
| // GNU linker before section groups were defined. The semantics are |
| // that we only include one linkonce section with a given name. The |
| // name of a linkonce section is normally .gnu.linkonce.T.SYMNAME, |
| // where T is the type of section and SYMNAME is the name of a symbol. |
| // In an attempt to make linkonce sections interact well with section |
| // groups, we try to identify SYMNAME and use it like a section group |
| // signature. We want to block section groups with that signature, |
| // but not other linkonce sections with that signature. We also use |
| // the full name of the linkonce section as a normal section group |
| // signature. |
| |
| template<int size, bool big_endian> |
| bool |
| Sized_relobj<size, big_endian>::include_linkonce_section( |
| Layout* layout, |
| const char* name, |
| const elfcpp::Shdr<size, big_endian>&) |
| { |
| const char* symname = strrchr(name, '.') + 1; |
| bool include1 = layout->add_comdat(symname, false); |
| bool include2 = layout->add_comdat(name, true); |
| return include1 && include2; |
| } |
| |
| // Lay out the input sections. We walk through the sections and check |
| // whether they should be included in the link. If they should, we |
| // pass them to the Layout object, which will return an output section |
| // and an offset. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::do_layout(const General_options& options, |
| Symbol_table* symtab, |
| Layout* layout, |
| Read_symbols_data* sd) |
| { |
| const unsigned int shnum = this->shnum(); |
| if (shnum == 0) |
| return; |
| |
| // Get the section headers. |
| const unsigned char* pshdrs = sd->section_headers->data(); |
| |
| // Get the section names. |
| const unsigned char* pnamesu = sd->section_names->data(); |
| const char* pnames = reinterpret_cast<const char*>(pnamesu); |
| |
| std::vector<Map_to_output>& map_sections(this->map_to_output()); |
| map_sections.resize(shnum); |
| |
| // Keep track of which sections to omit. |
| std::vector<bool> omit(shnum, false); |
| |
| // Skip the first, dummy, section. |
| pshdrs += This::shdr_size; |
| for (unsigned int i = 1; i < shnum; ++i, pshdrs += This::shdr_size) |
| { |
| typename This::Shdr shdr(pshdrs); |
| |
| if (shdr.get_sh_name() >= sd->section_names_size) |
| { |
| fprintf(stderr, |
| _("%s: %s: bad section name offset for section %u: %lu\n"), |
| program_name, this->name().c_str(), i, |
| static_cast<unsigned long>(shdr.get_sh_name())); |
| gold_exit(false); |
| } |
| |
| const char* name = pnames + shdr.get_sh_name(); |
| |
| if (this->handle_gnu_warning_section(name, i, symtab)) |
| { |
| if (!options.is_relocatable()) |
| omit[i] = true; |
| } |
| |
| bool discard = omit[i]; |
| if (!discard) |
| { |
| if (shdr.get_sh_type() == elfcpp::SHT_GROUP) |
| { |
| if (!this->include_section_group(layout, i, shdr, &omit)) |
| discard = true; |
| } |
| else if (Layout::is_linkonce(name)) |
| { |
| if (!this->include_linkonce_section(layout, name, shdr)) |
| discard = true; |
| } |
| } |
| |
| if (discard) |
| { |
| // Do not include this section in the link. |
| map_sections[i].output_section = NULL; |
| continue; |
| } |
| |
| off_t offset; |
| Output_section* os = layout->layout(this, i, name, shdr, &offset); |
| |
| map_sections[i].output_section = os; |
| map_sections[i].offset = offset; |
| } |
| |
| delete sd->section_headers; |
| sd->section_headers = NULL; |
| delete sd->section_names; |
| sd->section_names = NULL; |
| } |
| |
| // Add the symbols to the symbol table. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::do_add_symbols(Symbol_table* symtab, |
| Read_symbols_data* sd) |
| { |
| if (sd->symbols == NULL) |
| { |
| gold_assert(sd->symbol_names == NULL); |
| return; |
| } |
| |
| const int sym_size = This::sym_size; |
| size_t symcount = sd->symbols_size / sym_size; |
| if (symcount * sym_size != sd->symbols_size) |
| { |
| fprintf(stderr, |
| _("%s: %s: size of symbols is not multiple of symbol size\n"), |
| program_name, this->name().c_str()); |
| gold_exit(false); |
| } |
| |
| this->symbols_ = new Symbol*[symcount]; |
| |
| const char* sym_names = |
| reinterpret_cast<const char*>(sd->symbol_names->data()); |
| symtab->add_from_relobj(this, sd->symbols->data(), symcount, sym_names, |
| sd->symbol_names_size, this->symbols_); |
| |
| delete sd->symbols; |
| sd->symbols = NULL; |
| delete sd->symbol_names; |
| sd->symbol_names = NULL; |
| } |
| |
| // Finalize the local symbols. Here we record the file offset at |
| // which they should be output, we add their names to *POOL, and we |
| // add their values to THIS->LOCAL_VALUES_ and their indexes in the |
| // output symbol table to THIS->LOCAL_INDEXES_. Return the symbol |
| // index. This function is always called from the main thread. The |
| // actual output of the local symbols will occur in a separate task. |
| |
| template<int size, bool big_endian> |
| unsigned int |
| Sized_relobj<size, big_endian>::do_finalize_local_symbols(unsigned int index, |
| off_t off, |
| Stringpool* pool) |
| { |
| gold_assert(this->symtab_shndx_ != -1U); |
| if (this->symtab_shndx_ == 0) |
| { |
| // This object has no symbols. Weird but legal. |
| return index; |
| } |
| |
| gold_assert(off == static_cast<off_t>(align_address(off, size >> 3))); |
| |
| this->local_symbol_offset_ = off; |
| |
| // Read the symbol table section header. |
| const unsigned int symtab_shndx = this->symtab_shndx_; |
| typename This::Shdr symtabshdr(this, |
| this->elf_file_.section_header(symtab_shndx)); |
| gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
| |
| // Read the local symbols. |
| const int sym_size = This::sym_size; |
| const unsigned int loccount = this->local_symbol_count_; |
| gold_assert(loccount == symtabshdr.get_sh_info()); |
| off_t locsize = loccount * sym_size; |
| const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
| locsize); |
| |
| this->local_values_.resize(loccount); |
| this->local_indexes_.resize(loccount); |
| |
| // Read the symbol names. |
| const unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
| off_t strtab_size; |
| const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
| &strtab_size); |
| const char* pnames = reinterpret_cast<const char*>(pnamesu); |
| |
| // Loop over the local symbols. |
| |
| const std::vector<Map_to_output>& mo(this->map_to_output()); |
| unsigned int shnum = this->shnum(); |
| unsigned int count = 0; |
| // Skip the first, dummy, symbol. |
| psyms += sym_size; |
| for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
| { |
| elfcpp::Sym<size, big_endian> sym(psyms); |
| |
| unsigned int shndx = sym.get_st_shndx(); |
| |
| if (shndx >= elfcpp::SHN_LORESERVE) |
| { |
| if (shndx == elfcpp::SHN_ABS) |
| this->local_values_[i] = sym.get_st_value(); |
| else |
| { |
| // FIXME: Handle SHN_XINDEX. |
| fprintf(stderr, |
| _("%s: %s: unknown section index %u " |
| "for local symbol %u\n"), |
| program_name, this->name().c_str(), shndx, i); |
| gold_exit(false); |
| } |
| } |
| else |
| { |
| if (shndx >= shnum) |
| { |
| fprintf(stderr, |
| _("%s: %s: local symbol %u section index %u " |
| "out of range\n"), |
| program_name, this->name().c_str(), i, shndx); |
| gold_exit(false); |
| } |
| |
| if (mo[shndx].output_section == NULL) |
| { |
| this->local_values_[i] = 0; |
| this->local_indexes_[i] = -1U; |
| continue; |
| } |
| |
| this->local_values_[i] = (mo[shndx].output_section->address() |
| + mo[shndx].offset |
| + sym.get_st_value()); |
| } |
| |
| // Decide whether this symbol should go into the output file. |
| |
| if (sym.get_st_type() == elfcpp::STT_SECTION) |
| { |
| this->local_indexes_[i] = -1U; |
| continue; |
| } |
| |
| if (sym.get_st_name() >= strtab_size) |
| { |
| fprintf(stderr, |
| _("%s: %s: local symbol %u section name " |
| "out of range: %u >= %u\n"), |
| program_name, this->name().c_str(), |
| i, sym.get_st_name(), |
| static_cast<unsigned int>(strtab_size)); |
| gold_exit(false); |
| } |
| |
| const char* name = pnames + sym.get_st_name(); |
| pool->add(name, NULL); |
| this->local_indexes_[i] = index; |
| ++index; |
| off += sym_size; |
| ++count; |
| } |
| |
| this->output_local_symbol_count_ = count; |
| |
| return index; |
| } |
| |
| // Write out the local symbols. |
| |
| template<int size, bool big_endian> |
| void |
| Sized_relobj<size, big_endian>::write_local_symbols(Output_file* of, |
| const Stringpool* sympool) |
| { |
| gold_assert(this->symtab_shndx_ != -1U); |
| if (this->symtab_shndx_ == 0) |
| { |
| // This object has no symbols. Weird but legal. |
| return; |
| } |
| |
| // Read the symbol table section header. |
| const unsigned int symtab_shndx = this->symtab_shndx_; |
| typename This::Shdr symtabshdr(this, |
| this->elf_file_.section_header(symtab_shndx)); |
| gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
| const unsigned int loccount = this->local_symbol_count_; |
| gold_assert(loccount == symtabshdr.get_sh_info()); |
| |
| // Read the local symbols. |
| const int sym_size = This::sym_size; |
| off_t locsize = loccount * sym_size; |
| const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
| locsize); |
| |
| // Read the symbol names. |
| const unsigned int strtab_shndx = symtabshdr.get_sh_link(); |
| off_t strtab_size; |
| const unsigned char* pnamesu = this->section_contents(strtab_shndx, |
| &strtab_size); |
| const char* pnames = reinterpret_cast<const char*>(pnamesu); |
| |
| // Get a view into the output file. |
| off_t output_size = this->output_local_symbol_count_ * sym_size; |
| unsigned char* oview = of->get_output_view(this->local_symbol_offset_, |
| output_size); |
| |
| const std::vector<Map_to_output>& mo(this->map_to_output()); |
| |
| gold_assert(this->local_values_.size() == loccount); |
| gold_assert(this->local_indexes_.size() == loccount); |
| |
| unsigned char* ov = oview; |
| psyms += sym_size; |
| for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
| { |
| elfcpp::Sym<size, big_endian> isym(psyms); |
| |
| if (this->local_indexes_[i] == -1U) |
| continue; |
| gold_assert(this->local_indexes_[i] != 0); |
| |
| unsigned int st_shndx = isym.get_st_shndx(); |
| if (st_shndx < elfcpp::SHN_LORESERVE) |
| { |
| gold_assert(st_shndx < mo.size()); |
| if (mo[st_shndx].output_section == NULL) |
| continue; |
| st_shndx = mo[st_shndx].output_section->out_shndx(); |
| } |
| |
| elfcpp::Sym_write<size, big_endian> osym(ov); |
| |
| gold_assert(isym.get_st_name() < strtab_size); |
| const char* name = pnames + isym.get_st_name(); |
| osym.put_st_name(sympool->get_offset(name)); |
| osym.put_st_value(this->local_values_[i]); |
| osym.put_st_size(isym.get_st_size()); |
| osym.put_st_info(isym.get_st_info()); |
| osym.put_st_other(isym.get_st_other()); |
| osym.put_st_shndx(st_shndx); |
| |
| ov += sym_size; |
| } |
| |
| gold_assert(ov - oview == output_size); |
| |
| of->write_output_view(this->local_symbol_offset_, output_size, oview); |
| } |
| |
| // Input_objects methods. |
| |
| // Add a regular relocatable object to the list. Return false if this |
| // object should be ignored. |
| |
| bool |
| Input_objects::add_object(Object* obj) |
| { |
| if (!obj->is_dynamic()) |
| this->relobj_list_.push_back(static_cast<Relobj*>(obj)); |
| else |
| { |
| // See if this is a duplicate SONAME. |
| Dynobj* dynobj = static_cast<Dynobj*>(obj); |
| |
| std::pair<Unordered_set<std::string>::iterator, bool> ins = |
| this->sonames_.insert(dynobj->soname()); |
| if (!ins.second) |
| { |
| // We have already seen a dynamic object with this soname. |
| return false; |
| } |
| |
| this->dynobj_list_.push_back(dynobj); |
| } |
| |
| Target* target = obj->target(); |
| if (this->target_ == NULL) |
| this->target_ = target; |
| else if (this->target_ != target) |
| { |
| fprintf(stderr, "%s: %s: incompatible target\n", |
| program_name, obj->name().c_str()); |
| gold_exit(false); |
| } |
| |
| return true; |
| } |
| |
| // Relocate_info methods. |
| |
| // Return a string describing the location of a relocation. This is |
| // only used in error messages. |
| |
| template<int size, bool big_endian> |
| std::string |
| Relocate_info<size, big_endian>::location(size_t relnum, off_t) const |
| { |
| std::string ret(this->object->name()); |
| ret += ": reloc "; |
| char buf[100]; |
| snprintf(buf, sizeof buf, "%zu", relnum); |
| ret += buf; |
| ret += " in reloc section "; |
| snprintf(buf, sizeof buf, "%u", this->reloc_shndx); |
| ret += buf; |
| ret += " (" + this->object->section_name(this->reloc_shndx); |
| ret += ") for section "; |
| snprintf(buf, sizeof buf, "%u", this->data_shndx); |
| ret += buf; |
| ret += " (" + this->object->section_name(this->data_shndx) + ")"; |
| return ret; |
| } |
| |
| } // End namespace gold. |
| |
| namespace |
| { |
| |
| using namespace gold; |
| |
| // Read an ELF file with the header and return the appropriate |
| // instance of Object. |
| |
| template<int size, bool big_endian> |
| Object* |
| make_elf_sized_object(const std::string& name, Input_file* input_file, |
| off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) |
| { |
| int et = ehdr.get_e_type(); |
| if (et == elfcpp::ET_REL) |
| { |
| Sized_relobj<size, big_endian>* obj = |
| new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr); |
| obj->setup(ehdr); |
| return obj; |
| } |
| else if (et == elfcpp::ET_DYN) |
| { |
| Sized_dynobj<size, big_endian>* obj = |
| new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); |
| obj->setup(ehdr); |
| return obj; |
| } |
| else |
| { |
| fprintf(stderr, _("%s: %s: unsupported ELF file type %d\n"), |
| program_name, name.c_str(), et); |
| gold_exit(false); |
| } |
| } |
| |
| } // End anonymous namespace. |
| |
| namespace gold |
| { |
| |
| // Read an ELF file and return the appropriate instance of Object. |
| |
| Object* |
| make_elf_object(const std::string& name, Input_file* input_file, off_t offset, |
| const unsigned char* p, off_t bytes) |
| { |
| if (bytes < elfcpp::EI_NIDENT) |
| { |
| fprintf(stderr, _("%s: %s: ELF file too short\n"), |
| program_name, name.c_str()); |
| gold_exit(false); |
| } |
| |
| int v = p[elfcpp::EI_VERSION]; |
| if (v != elfcpp::EV_CURRENT) |
| { |
| if (v == elfcpp::EV_NONE) |
| fprintf(stderr, _("%s: %s: invalid ELF version 0\n"), |
| program_name, name.c_str()); |
| else |
| fprintf(stderr, _("%s: %s: unsupported ELF version %d\n"), |
| program_name, name.c_str(), v); |
| gold_exit(false); |
| } |
| |
| int c = p[elfcpp::EI_CLASS]; |
| if (c == elfcpp::ELFCLASSNONE) |
| { |
| fprintf(stderr, _("%s: %s: invalid ELF class 0\n"), |
| program_name, name.c_str()); |
| gold_exit(false); |
| } |
| else if (c != elfcpp::ELFCLASS32 |
| && c != elfcpp::ELFCLASS64) |
| { |
| fprintf(stderr, _("%s: %s: unsupported ELF class %d\n"), |
| program_name, name.c_str(), c); |
| gold_exit(false); |
| } |
| |
| int d = p[elfcpp::EI_DATA]; |
| if (d == elfcpp::ELFDATANONE) |
| { |
| fprintf(stderr, _("%s: %s: invalid ELF data encoding\n"), |
| program_name, name.c_str()); |
| gold_exit(false); |
| } |
| else if (d != elfcpp::ELFDATA2LSB |
| && d != elfcpp::ELFDATA2MSB) |
| { |
| fprintf(stderr, _("%s: %s: unsupported ELF data encoding %d\n"), |
| program_name, name.c_str(), d); |
| gold_exit(false); |
| } |
| |
| bool big_endian = d == elfcpp::ELFDATA2MSB; |
| |
| if (c == elfcpp::ELFCLASS32) |
| { |
| if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) |
| { |
| fprintf(stderr, _("%s: %s: ELF file too short\n"), |
| program_name, name.c_str()); |
| gold_exit(false); |
| } |
| if (big_endian) |
| { |
| elfcpp::Ehdr<32, true> ehdr(p); |
| return make_elf_sized_object<32, true>(name, input_file, |
| offset, ehdr); |
| } |
| else |
| { |
| elfcpp::Ehdr<32, false> ehdr(p); |
| return make_elf_sized_object<32, false>(name, input_file, |
| offset, ehdr); |
| } |
| } |
| else |
| { |
| if (bytes < elfcpp::Elf_sizes<32>::ehdr_size) |
| { |
| fprintf(stderr, _("%s: %s: ELF file too short\n"), |
| program_name, name.c_str()); |
| gold_exit(false); |
| } |
| if (big_endian) |
| { |
| elfcpp::Ehdr<64, true> ehdr(p); |
| return make_elf_sized_object<64, true>(name, input_file, |
| offset, ehdr); |
| } |
| else |
| { |
| elfcpp::Ehdr<64, false> ehdr(p); |
| return make_elf_sized_object<64, false>(name, input_file, |
| offset, ehdr); |
| } |
| } |
| } |
| |
| // Instantiate the templates we need. We could use the configure |
| // script to restrict this to only the ones for implemented targets. |
| |
| template |
| class Sized_relobj<32, false>; |
| |
| template |
| class Sized_relobj<32, true>; |
| |
| template |
| class Sized_relobj<64, false>; |
| |
| template |
| class Sized_relobj<64, true>; |
| |
| template |
| struct Relocate_info<32, false>; |
| |
| template |
| struct Relocate_info<32, true>; |
| |
| template |
| struct Relocate_info<64, false>; |
| |
| template |
| struct Relocate_info<64, true>; |
| |
| } // End namespace gold. |